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diff --git a/src/include/edoors_iota.h b/src/include/edoors_iota.h
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+/* EDOORS
+ * Copyright (C) 2012 Jérémy Zurcher
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;
+ * if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __EDOORS_IOTA_H__
+#define __EDOORS_IOTA_H__
+
+#include <eina_stringshare.h>
+
+/**
+ * @enum _Edoors_Type
+ * List of available Edoors_Iota
+ */
+typedef enum _Edoors_Type
+{
+   EDOORS_TYPE_SPIN=0,
+   EDOORS_TYPE_ROOM,
+   EDOORS_TYPE_DOOR,
+   EDOORS_TYPE_BOARD,
+   EDOORS_TYPE_COUNT
+} Edoors_Type;
+
+/**
+ * @typedef Edoors_Iota
+ * Type for structural and  hierachical info
+ */
+typedef struct _Edoors_Iota Edoors_Iota;
+
+/**
+ * @struct _Edoors_Iota
+ * Struct for structural and  hierachical info.
+ */
+struct _Edoors_Iota {
+    Edoors_Type         type;       /**< type of the iota */
+    Edoors_Iota         *spin;      /**< top level iota which is a @ref Edoors_Spin */
+    Edoors_Iota         *parent;    /**< direct parent in the hierarchy */
+    Eina_Stringshare    *name;      /**< iota's name */
+    Eina_Stringshare    *path;      /**< full path to this @ref Edoors_Iota */
+};
+
+/**
+ * @defgroup Edoors_Iota Edoors_Iota
+ *
+ * This is the structural info stored in each @ref Edoors_Room, @ref Edoors_Door, @ref Edoors_Board
+ *
+ * @{
+ */
+
+/**
+ * @brief Print iota information using EINA_LOG_DBG.
+ *
+ * @param iota The @ref Edoors_Iota to show.
+ */
+EAPI void edoors_iota_show(Edoors_Iota *iota);
+
+/**
+ * @brief Free allocated resources.
+ *
+ * @param iota The @ref Edoors_Iota to free.
+ *
+ */
+void edoors_iota_free(Edoors_Iota *iota);
+
+/**
+ * @brief Require a @ref Edoors_Particle from the free list.
+ *
+ * @see edoors_spin_require_particle
+ */
+#define edoors_iota_require_particle(_iota) edoors_spin_require_particle((Edoors_Spin*)(_iota)->spin)
+
+/**
+ * @brief Release a particle.
+ *
+ * @see edoors_spin_release_particle
+ */
+#define edoors_iota_release_particle(_iota,_particle) edoors_spin_release_particle((Edoors_Spin*)(_iota)->spin,_particle)
+
+/**
+ * @}
+ */
+
+#endif // __EDOORS_IOTA_H__